Answer:
a and f
Step-by-step explanation:
a. x + 3 = 5x - 4
x - 5x = -4 - 3
-4x = -7
x = -7/-4
x = 7/4
b. x - 3 = 5x + 4
x - 5x = 4 - 3
-4x = 1
x = -1/4
c. 2x + 8 = 5x - 3
2x - 5x = -3 - 8
-3x = -11
x = -11/-3
x = 11/3
d. 10x + 6 = 2x - 8
10x - 2x = -8 - 6
8x = -14
x = -14/8
e. 10x - 8 = 2x + 6
10x - 2x = 6 + 8
8x = 14
x = 14/8
f. 0.3 + x/10 = 1/2x - 0.4
3/10 + x/10 = 1/2x - 4/10
x/10 - 1/2x = -3/10 - 4/10
x/10 - 5/10x = -7/10
-4x/10 = -7/10
-4x = -7
x = -7/-4
x = 7/4
Answer:
x = 11
Step-by-step explanation:
• All interior angles in a triangle add up to 180.
• The square in the triangle represents 90°
90 + 45 + 1 + 4x = 180
136 + 4x = 180
4x = 180 - 136
4x = 44
x = 11
Ccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc
